DeflateFrameServerExtensionHandshaker.java — netty Source File

Source Code

/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.codec.http.websocketx.extensions.compression;

import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionData;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionDecoder;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionEncoder;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketExtensionFilterProvider;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketServerExtension;
import io.netty.handler.codec.http.websocketx.extensions.WebSocketServerExtensionHandshaker;

import java.util.Collections;

import static io.netty.util.internal.ObjectUtil.*;

/**
 * <a href="https://tools.ietf.org/id/draft-tyoshino-hybi-websocket-perframe-deflate-06.txt">perframe-deflate</a>
 * handshake implementation.
 */
public final class DeflateFrameServerExtensionHandshaker implements WebSocketServerExtensionHandshaker {

    public static final int DEFAULT_COMPRESSION_LEVEL = 6;

    static final String X_WEBKIT_DEFLATE_FRAME_EXTENSION = "x-webkit-deflate-frame";
    static final String DEFLATE_FRAME_EXTENSION = "deflate-frame";

    private final int compressionLevel;
    private final WebSocketExtensionFilterProvider extensionFilterProvider;
    private final int maxAllocation;

    /**
     * Constructor with default configuration.
     * @deprecated
     *            Use {@link DeflateFrameServerExtensionHandshaker#DeflateFrameServerExtensionHandshaker(int, int)}
     *            with {@link DeflateFrameServerExtensionHandshaker#DEFAULT_COMPRESSION_LEVEL}.
     */
    @Deprecated
    public DeflateFrameServerExtensionHandshaker() {
        this(DEFAULT_COMPRESSION_LEVEL, 0);
    }

    /**
     * Constructor with custom configuration.
     *
     * @param compressionLevel
     *            Compression level between 0 and 9 (default is 6).
     * @deprecated
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